This is an optional MIP Yeti X-Duty Rear C-Drive Kit. Since the Yeti comes stock with a plastic rear driveshaft, the guys at MIP knew an X-duty Drive was the perfect option for this heavy duty rock racer. With a few adjustments to the proven X-duty drive hubs, MIP was able to fit in a rock crawling and basher approved X-duty design axle to accommodate all the power and thrashing you may put it through. Buy once, buy MIP! Made 100% in the USA!